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86 INSTALLATION, INTERFACE INFORMATION, AND SPECIFICATIONS
Figure 5-4 Standard Terminal Port (STP) Installation
I
2. CONNECT 10-CONDUCTOR CABLE TO J1 ON STP MODULE.
3. RUN CABLE BEHIND STP MODULE TO CONSOLE INTERFACE. DO NOT TWIST OR INVERT CABLE.
4. INSERT SPACERS BETWEEN STP MODULE AND TERMINAL CON-TROLLER MODULE. SECURE WITH MOUNTING HARDWARE.
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INSTALLATION. INTERFACE INFORMATION. AND SPECIFICATIONS 87
d. Connect the other end of this cable to your console serial line interface.
Example:
1. Connect the cable to channel 3 (J3) on a DLV11-J. or 2. Connect the cable to channel 1 (J2) on an MXV11.
Install the connector right side up with no twists in the cable.
NOTE
When connecting asynchronous serial line inter-faces to the STP module, disconnect the baud rate selection for those channels on their line interface module. The console baud rate is automatically pro-vided by the terminal controller at approximately 15K baud. The baud for the second communication interface can be selected, using the transmit speed (T SPEED) in set-up B.
e. OPTIONAL - If you have a second serial line unit with a 10-pin connector, run a cable from this unit behind the STP module and connect to J2 on the STP module. as shown in Figure 5-5. Con-nect the communications cable from the second unit to the EIA connector on the rear of the terminal.
OPTIONAL - If you have a second serial line unit (synchronous or asynchronous) with a 40-pin connector. connect one end of a BCOSR-01 cable (not supplied) to J3 on the STP module with the connector right side up, as shown in Figure 5-6. Do not twist the cable. Connect the other end of this cable to the serial line unit installing the connector upside down. Connect the commu-nications cable (or modem cable) to the EIA connector on the rear of the terminal. Asynchronous serial line interfaces (DLV11-E/-F) must be configured for common speed.
NOTE
When using a second serial line unit with the STP module, EIA pin 24 (CLOCK EXT L) and pin 25 (FORCE BUSY) are not available for use.
f. Insert spacers at locations A and B between the terminal con-troller module and the STP module and fasten the modules to-gether using the supplied hardware.
NOTE
Refer to Chapter 6 for installation of the advanced video module if you are installing that option on the terminal controller at this time.
88 INSTALLATION, INTERFACE INFORMATION, AND SPECIFICATIONS
SPACER
STP
CONNECTOR
TERMINAL CONTROLLER MODULE
1ST CONSOLE
2ND SERIAL INTERFACE WITH 10-PIN CONNECTOR
10-PIN CONNECTOR
TO EXTERNAL COMMUNICATIONS DEVICE
EIA
COMMUNICATIONS CONNECTOR
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Figure 5-5 Connecting a Second Serial Interface on the STP Module Using the 10-Pin Connector
INSTALLATION. INTERFACE INFORMATION. AND SPECIFICATIONS 89
lST CONSOLE INTERFACE
EIA
TO EXTERNAL COMMUNICATIONS DEVICE OR MODEM
/
COMMUN !CATIONS CONNECTOR
Figure 5-6 Connecting a Second Serial Interface on the STP Module Using the 40-Pin Connector
40-PIN CONNECTOR
PLUG CABLE IN REVERSED AS SHOWN ON THIS END ONLY.
BC08R-01
40-CONDUCTOR CABLE (NOT SUPPLIED)
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90 INSTALLATION, INTERFACE INFORMATION, AND SPECIFICATIONS
g. Install the terminal controller in J 1 of the VT103 backplane.
NOTES
1. At this time, you may configure any other LSl-11 modules within the VT103 backplane. Refer to the Memories and Peripherals handbook for available options and installation procedures.
2. For more than two serial interfaces or for other peripheral devices, run their cables out the bot-tom rear of the VT1 03 cabinet between the rear cover and the lower base of the VT103.
3. A jumper (W1) on the STP module is available for the user to connect the signal IN IT L from the terminal controller module to pin 1 of J 1 . IN IT L may be used to initialize the micro-computer system. Note however, that pin 1 has
+
12 V supplied by the serial interface which must be disconnected from the serial line inter-face module if W1 is installed.4. If the STP module is removed from the terminal controller module, ensure that the pins in the STP connector come together to reconnect all communications lines.
CAUTION
If you install any options other than those built by DIGITAL, ensure that each option complies with DEC Standard 119 on Product Safety.
7. Install module support guides to hold dual-height modules securely in the VT103 backplane. Quad-height modules do not need these support guides. To install the guide correctly:
a. Hold the guide by the plastic connector with both ends pointing away from you and to the left.
b. Insert the bottom end in the hole in the bottom bracket of the card cage assembly, near the module to be secured.
c. Bend the module support guide slightly and insert its other end in the hole in the top. bracket of the card cage assembly.
d. Apply a slight pressure to the plastic connector and secure it to the module.
NOTE
When installed correctly, the module support guide should line up with the edge of the module, as shown in Figure 5- 7. If installed upside down, the plastic connector cannot be attached to the module.
INSTALLATION, INTERFACE INFORMATION, AND SPECIFICATIONS 91
MR-3416
Figure 5- 7 Module Support Guide Installation
92 INSTALLATION, INTERFACE INFORMATION, AND SPECIFICATIONS
8. Replace the module access cover.
9. Place the keyboard in front of the terminal and plug the keyboard coiled cord into the keyboard receptacle located on the rear of the terminal the keyboard is turned on. After approximately one minute, the cursor is visible in the upper-left corner of the screen. If any other indication is shown. refer to Chapter 1 to isolate the problem.
12. Set the desired set-up features as outlined in Chapter 1.
13. Once the installation procedure is complete, record the set-up features selected on the set-up label and attach the label to the underside of the keyboard.
5.4 INTERFACE INFORMATION
EIA Interface and Electrical Characteristics
The video terminal operates on full duplex, asynchronous communication lines.
The terminal controller board interfaces to the line with a 25-pin connector mounted on the back of the terminal that meets EIA specification RS-232-C. Table 5-2 summarizes the EIA connector signals.
Ignored by terminal controller unit (TCU) Ignored by TCU
Terminal chassis ground (common re-turn)
INSTALLATION. INTERFACE INFORMATION. AND SPECIFICATIONS 93
94 INSTALLATION, INTERFACE INFORMATION, AND SPECIFICATIONS
Output Voltages - On all signals from the terminal. the MARK or unasserted state is -6.0 V to -12.0 V; the SPACE or asserted state is +6.0 V to + 12.0 V.
Input Voltages - On signals to the terminal, -25.0 V to +0.75 V or an open circuit is interpreted as a MARK, ON. or unasserted state, and +25.0 V to +2.25 Vis interpreted as a SPACE, OFF. or asserted state. Voltages greater in magnitude than ±25 V are not allowed. These levels are compatible with EIA STD RS-232-C and CCITT Recommendation V.28.
5.5 EXTERNAL VIDEO CONNECTION
The VT103 is capable of easily interfacing to external video devices. The video devices may act either as a slave to the VT 103 when connected to the composite video output or provide synchronized video data to the VT103. The external video connectors are the two female BNC connectors located on the back of the terminal just below the EIA connector. The upper connector, J8. is the video input; the lower connector, J9. is the video output.
5.5.1 Composite Video Output (J9)
The composite video output provides RS 170-like output (see note) generated by combining the video signal with a composite sync signal. This output contains all video data appearing on the VT103 screen except the video that comes from J8.
The output has the following nominal characteristics. (Also, see Figure 5-8.)
1. Output impedance
=
75 ohms. de-coupled 2. Sync level = 0 V3. Black level
=
approximately 0.3 V with a 75 ohms load 4. White level = approximately 1.0 V with a 75 ohm load5. The composite sync waveform conforms to EIA RS 170 standards. The vertical interval is composed of six equalizing pulses, six vertical sync pulses. and six more equalizing pulses. The timing is as follows:
Equalizing pulse width
=
2.33µs± 50 ns Vertical sync width=
27.28µs±200 ns Horizontal sync width = 4.71µs±50 nsHorizontal blank time
=
11.84µs±50 ns(80 column mode) Front porchHorizontal period
NOTE
= 12.34µs±50 ns(132 column mode)
=
1.54µs±50 ns=
63. 56µs± 50 nsThe use of decoupling is not in strict agreement with RS170. To agree with RS170, the output load requires a 10 µF capacitor in series with the output.
This presents no problem with most monitors as they are ac-coupled.
EVEN FIELD:
LAST DISPLAYED SCAN OF
1.0 v
ov T I M E
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_ _ _ _ _ _ v_ER_T_1c_A_L_B_L_A_NK_1_N_G_1_NT_E_R_v_A_L___ 60 Hz INT =_22 SCANS _ _ _ .,.
IN NON-INTERLACED OPERATION, THE EVEN FIELD IS REPEATED CONTIN-UOUSLY. AND THE ODD FIELD IS NOT USED.
IN INTERLACED OPERATION, THE' EVEN FIELD ALTERNATES WITH THE ODD
An analog signal applied to the video input is ORed with the internal video signal.
The beam intensity at any point on the screen corresponds to the intensity of the signal that would make the beam brighter. A video signal on this input affects only the internal screen and does not appear on the composite video output J9. This input has the following nominal characteristics:
1. Input impedance
=
75 ohms, de-coupled 2. Black level=
0 V3. White level = 1.0 V
4. Maximum continuous input = ±2.0 V.
NOTE
The external video source must be synchronized to the VT103 by referencing the composite sync on the composite video output.